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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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[quote user="drdna"]…… people forget that a circuit is a physical collection of dynamically interacting electromagnetic fields…… [/quote]
Isn’t it might a separate VERY large subject?
[quote user="drdna"] The low level resolution is exquisite but t...
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I was contemplating the 6 Channel Super Melquiades conversion – it will quite a revision – and I am slowly inclining to make it not 6 Channel but 7 channels…Anyhow, the post will not be about the needs of extra 7th channel but rather about one of the...
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The Netherlanders Tony Gee after geting sick to fight with his stupid Fostexes and Lowthers have his run over capacitors.
http://www.humblehomemadehifi.com/Cap.htmlThe Cat...
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JUst a thought I've been sitting on for a while.No, I've never tried finding the stuff.Some kind of mineral oil with excelent dielectric properties.Paul S...
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I am taking about coupling capacitor between driver tube and the DHT. There are zillion way to do it and no one said that they need to be used. No one proved yet that a very good quality of caps shell be worse than other methods. In my case since the...
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This is exactly what I settled on in my SET amplifiers, so at least it gives some credence that we all seem to agree.Adrian...
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I do not think that Lamm uses input capacitor, come on, this is not am amp from Radio Shack! Anyhow, I would not use input capacitor under any circumstances, would it be for filtration or for any other reasons. Yes, ML2 used global feedback....
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Hi Romy, I imagine the coupling cap in the full range melq acts as a first order high pass filter: is there any reason why one could not lower its value to raise the cutoff to a level one would otherwise redundantly need a speaker-level filter to ach...
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Daniel, if you have start, the igniting voltage, on the gas tubes 197V then it is perfect. If the tubes do maintain stable 150C then leave it as it. Each of the gas tribes has own stabilization voltage. If one of them has let say 148V and another 150...
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Hi Romy,I am currently in the process of rebuilding my 834 PT. I see you don't use the capacitor bypass on V2, does this have any effect on overall gain of the corrector? I've recently acquired audio Technica ART7 cartridge which is low (0.12 mv) out...
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Hi Guys,The output impedance of ECC83 in cathode follower is around 625 Oms. But 1uF capacitor makes output impedance very big on low frequencies (around 8K Ohm at 20Hz). And in this schematics the global feedback doesn't work at low frequencies. So ...
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If C10 is connected backwards there could well be a large leakage current through it. It may also have been damaged if this is the case, requiring its replacement....
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Domidaw, you are looking at the right things but there is something to consider: when you put a resistance meter across a discharged capacitor you see a low resistance initially because the battery in the meter is charging the capacitor a little, so ...
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Here is a good material with Chinese capacitor shootout
http://www.goodsoundclub.com/PDF/capacitorshootout.pdf
It looks like more or less intelligent writing, thought the caps sitting between stage and caps sitting in feedback work differently (con...
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You point out that if a capacitor can hum it is faulty and wound improperly. You are absolutely correct - the way a capacitor is wound will determine if it can hum or not. Unfortunately almost all capacitors on the market are wound in a way that...
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[quote user="PurePower"] You point out that if a capacitor can hum it is faulty and wound improperly.
You are absolutely correct - the way a capacitor is wound will determine if it can hum or not. Unfortunately almost all capacitors on the m...
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[quote user="PurePower"]Hi Max,If you have buzzing that is audible outside the PurePower case, or audible from a listening position, the behavior is not normal. The probable source is a capacitor. Caps can hum in the same way as transformers - the fo...
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I tried the V-caps in my system and it changed the sound. This is not a big surprise. Any time you change caps, even to the same cap, it is not broken in and you have been soldering and tinkering with your system, and it needs time to set...
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Hi Guys,The output impedance of ECC83 in cathode follower is around 625 Oms. But 1uF capacitor makes output impedance very big on low frequencies (around 8K Ohm at 20Hz). And in this schematics the global feedback doesn't work at low frequencies. So ...
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Adrian Thank you for helpI think i should 100% agree youDid you compared class ab vs class a power amp when you connect them to pp3000?xandcgI have read about romy experience with paralleling capacitor with battery but it seems it does not help .I ha...
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One of the most interesting outcomes of the Milq conversion into 6 channels is the impact it had to it MF channel. The tweeter is a separate subject, I still work on it, I know how it will be done but I did not hear the final result. I would li...
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Grid leak bias is not reliable itself . Grid current is very low and grid resistor is very big , the circuit become very sensitive to all destabilizing factors - capacitor leak , humidity , temperature . And when we apply a big input signal to t...
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I do not think that Lamm uses input capacitor, come on, this is not am amp from Radio Shack! Anyhow, I would not use input capacitor under any circumstances, would it be for filtration or for any other reasons. Yes, ML2 used global feedback....
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[quote user="haralanov"] According to a friend of mine, who has a lot of experience with GM70, this tube starts to sing only with (very high quality) interstage transformer coupling. He told me that when it is used with coupling capacitor (as is the ...
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[quote user="floobydust"] The main component that limits low-frequency response in any SET is the OPT. For these initial designs, I used the smallest Hashimoto SE OPTs... their H-203S for the 2A3 and their H-507S for the 45 which are rated at 7...
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Paul, Some good valid points... yes, they've gotten much better over the years, no doubt to technology improvements. A good example is Mallory CGS caps made in the 80's versus new ones. The newer ones are much lighter physically (same p/n), hence th...
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Hello every body, I live in France and I'm new on this forum.I'm thinking to build (some months) a mono big Single Ended amplifier (200-300 watts) made with triodes (IDHT or DHT doesn't matter for me) for outdoor professional audio.Have you got an on...
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First, Adrian, Thanks for your feedback on the newer designed 2A3 tubes... very interesting. I've looked at all 3 of these brands before but have not as of yet purchased any (I have a large collection of 45 and 2A3 of various NOS US brands...
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Romy,I might be confused with the passive and active, but from my understanding you prefer your active 834PT to the passive RC network and passive LCR networks. You also prefer the passive LCR to the passive RC. So 834PT>LCR>RC.If I got it righ...
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[quote user="Romy the Cat"]The re-charged cap works fine but changing the cap polarity by re-recharging is while it handles the signal is not a very good idea in my view. All that dialectic in the cap needs to be re-polarized – it sound too unattract...
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